You might want to consider this link too.
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http://www.phys.gwu.edu/iplswiki/index.php/Main_Page=20
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I have started a conversation in the PIRA forum on this topic. Maybe it =
can get carried on there too.
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It hope this link will take you there
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http://physicslearning2.colorado.edu/piraforum/index.php?board=3D4.0=20
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Merritt

>>> Richard Berg 5/20/2011 1:10 PM >>>

Ballistocardiography - You only need an analog bathroom scale:

http://www.physics.umd.edu/lecdem/outreach/QOTW/arch11/q203.htm=20

Nice one for anyone - this topic is apparently becoming more relevant=20
lately.